To avoid boundary artifacts and estimate really the frequency content of the image (and not of the artifacts!), one needs to multiply M by a smooth windowing function h and compute fft2(M.*h). Use a sine windowing function. Can you interpret the resulting filter ?

toolbox_signal\.DS_Store
..............\CS.sci
..............\Fourier.sci
..............\barb.bmp
..............\batch_convert_bin.m
..............\bird.wav
..............\boat.bmp
..............\brain.bin
..............\callback_optical_flow.m
..............\cameraman.png
..............\cconv.m
..............\cconv.sci
..............\centaur1.png
..............\centaur2.png
..............\clouds.gif
..............\compute_conditional_histogram.m
..............\compute_entropy.m
..............\compute_entropy.sci
..............\compute_gaussian_filter.m
..............\compute_gaussian_filter.sci
..............\compute_histogram.m
..............\compute_hufftree.m
..............\compute_hufftree.sci
..............\compute_l2err.m
..............\compute_l2err.sci
..............\compute_movie_file.m
..............\compute_quadsel.m
..............\compute_quadsel.sci
..............\compute_shape_boundary.m
..............\compute_total_variation.m
..............\compute_wavelet_filter.m
..............\compute_wavelet_filter.sci
..............\corral.bmp
..............\cortex.bmp
..............\dct.m
..............\dct.sci
..............\dct2.m
..............\dct2.sci
..............\div.m
..............\div.sci
..............\drum.wav
..............\female.wav
..............\fftn.sci
..............\fingerprint.jpg
..............\fire.gif
..............\flowers.bmp
..............\glockenspiel.wav
..............\grad.m
..............\grad.sci
..............\hair.bmp
..............\hibiscus.bmp
..............\hist.sci
..............\huffman_gencode.m
..............\huffman_gencode.sci
..............\iCS.sci
..............\iFourier.sci
..............\idct.m
..............\idct.sci
..............\idct2.m
..............\idct2.sci
..............\ifft2.sci
..............\ifftn.sci
..............\image_resize.m
..............\image_resize.sci
..............\imageplot.m
..............\imageplot.sci
..............\iradon.m
..............\isosurface.sci
..............\lena.bmp
..............\load_hdr.m
..............\load_image.m
..............\load_image.sci
..............\load_signal.m
..............\load_signal.sci
..............\load_sound.m
..............\load_sound.sci
..............\mad.m
..............\male.wav
..............\mandrill.bmp
..............\mri.bin
..............\mri.png
..............\parrot-mask.png
..............\parrot.bmp
..............\peppers-bw.bmp
..............\perform_arith_coding.m
..............\perform_arith_coding.sci
..............\perform_arith_fixed.m
..............\perform_arith_fixed.sci
..............\perform_blurring.m
..............\perform_blurring.sci
..............\perform_color_matching.m
..............\perform_convolution.m
..............\perform_convolution.sci
..............\perform_curvelet_transform.m
..............\perform_haar_transf.m
..............\perform_haar_transf.sci
..............\perform_hist_eq.m
..............\perform_hist_eq.sci
..............\perform_homotopy.m
..............\perform_huffcoding.m

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